Gate charge and switching — what the 33.3 nC means at the bench
Total gate charge at 10 V is 33.3 nC, and the input capacitance (Ciss) measures 983 pF at 50 V drain bias. For a hard-switched converter running at 100 kHz, the average gate-drive current needed is about 3.3 mA — easily within a standard MOSFET driver. The low Qg relative to the 650 V class means the STF15NM65N is suited for power-factor-correction stages and flyback converters where switching losses matter.
Temperature range and rework considerations
The TO-220FP package has a larger plastic body than a standard TO-220 — the full-pack moulding adds thermal mass, so a hot-air rework station needs a higher preheat to get the solder joints flowing without cooking the die. Maximum power dissipation is 30 W at case temperature, but the actual limit depends on the heatsink and ambient. The isolated tab means the back of the part can be clamped directly to a grounded heatsink without a thermal pad.